But when you do a charitable deed, do not let your left hand know what your right hand is doing,
Matthew 6:3
Surrounding context
6:2 Therefore, when you do a charitable deed, do not sound a trumpet before you as the hypocrites do in the synagogues and in the streets, that they may have glory from men. Assuredly, I say to you, they have their reward.
6:3 But when you do a charitable deed, do not let your left hand know what your right hand is doing,
6:4 that your charitable deed may be in secret; and your Father who sees in secret will Himself reward you openly.